CM690锚链钢冲击性能波动原因分析

doi:10.13251/j.issn.0254-6051.2026.02.008

摘要/Abstract

摘要： 针对某钢铁公司CM690锚链钢热处理(淬火+回火)后出现的冲击性能波动的现象,对CM690锚链钢不同冲击性能试样进行了断口形貌观察、化学成分测试、原始奥氏体晶粒尺寸测量、显微组织表征、晶体学特征分析及数值模拟分析等,研究了造成冲击性能波动的原因。结果表明,CM690锚链钢热处理后,不同冲击性能试样的化学成分和原始奥氏体晶粒尺寸较为接近;但低韧性试样的显微组织中含有更多的上贝氏体组织及更低的大角度晶界密度,CM690锚链钢冲击性能波动与其显微组织有关。而造成显微组织差异的主要原因源于CM690锚链钢热处理后冲击试样的取样方法。在距淬火圆棒端面不同位置处取样会导致不同冲击试样的淬火冷却速率不同和显微组织差异,从而导致冲击性能波动。

关键词: CM690锚链钢, 冲击性能, 冷却速率, 晶体学

Abstract: In response to the phenomenon of fluctuation in impact property of CM690 chain steel after heat treatment (quenching and tempering) at a steel company, the reasons for the impact property fluctuations of CM690 chain steel specimens exhibiting different impact properties were investigated through analyses of fracture morphology, chemical composition, prior austenite grain size, microstructure, crystallographic characteristics, and numerical simulation. The results indicate that after heat treatment, the chemical composition and prior austenite grain size of CM690 chain steel specimens with different impact properties are relatively close to each other, while the microstructure of the low toughness specimen contains a higher proportion of upper bainite and exhibits a smaller high-angle grain boundary density, indicating that the fluctuation of impact property of CM690 chain steel is related to its microstructure, while the differences in microstructure is related to the sampling method of impact specimens after heat treatment of the CM690 chain steel. Sampling at different distances from the quenched round rod end results in different quenching cooling rates and microstructure, further resulting the fluctuation of impact property.

Key words: CM690 chain steel, impact property, cooling rate, crystallography

中图分类号:

TG142.1

杨成威, 朱鹏龙, 叶玉奎, 谢常胜, 王凯勋, 赵海涛. CM690锚链钢冲击性能波动原因分析[J]. 金属热处理, 2026, 51(2): 53-60.

Yang Chengwei, Zhu Penglong, Ye Yukui, Xie Changsheng, Wang Kaixun, Zhao Haitao. Cause analysis of impact property fluctuation in CM690 chain steel[J]. Heat Treatment of Metals, 2026, 51(2): 53-60.

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